Adam Clarke on Esther 9:3

And all the rulers of the provinces - Mordecai being raised to the highest confidence of the king, and to have authority over the whole realm, these officers assisted the Jews, no doubt, with the troops under their command, to overthrow those who availed themselves of the former decree to molest the Jews. For it does not appear that the Jews slew any person who did not rise up to destroy them. See Est 9:5.